jp0317 commented on code in PR #39818:
URL: https://github.com/apache/arrow/pull/39818#discussion_r1473279494
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cpp/src/parquet/column_reader.cc:
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@@ -70,6 +70,8 @@ namespace {
// The minimum number of repetition/definition levels to decode at a time, for
// better vectorized performance when doing many smaller record reads
constexpr int64_t kMinLevelBatchSize = 1024;
+// The max buffer size of validility bitmap for skipping buffered levels.
+constexpr int64_t kMaxSkipLevelBufferSize = 128;
Review Comment:
yeah, i think memcpy 128B is probably fine here (typically two/three cache
lines), comparing to re-creating buffer
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